Table 3a: Model 2a: Relative mortality risk estimated
by a multivariate survival model which includes simultaneously the second-order
interactions between "time lived since last birthday" and "month of
birth", and the covariates "sex" and "period".

Time lived since
last birthday

1-12 weeks

13-40 weeks

41-52 weeks

Covariates

RMR

p-value

RMR

p-value

RMR

p-value

Month of birth

Weeks 1-4
(1 Jan 28 Jan)

1.00 (RG)

1.09

0.000

0.97

0.002

Weeks 5-8
(29 Jan 25 Feb)

1.02

0.074

1.10

0.000

0.97

0.001

Weeks 9-12
(26 Feb  25 Mar)

1.12

0.000

1.10

0.000

0.99

0.452

Weeks 13-16
(26 Mar  22 Apr)

1.20

0.000

1.06

0.000

1.02

0.025

Weeks 17-20
(23 Apr  20 May)

1.22

0.000

1.02

0.075

1.10

0.000

Weeks 21-24
(21 May  17 Jun)

1.20

0.000

1.00

0.652

1.17

0.000

Weeks 25-28
(18 Jun  15 Jul)

1.13

0.000

1.00

0.380

1.16

0.000

Weeks 29-32
(16 Jul  12 Aug)

1.01

0.280

1.02

0.021

1.18

0.000

Weeks 33-36
(13 Aug  9 Sep)

0.98

0.060

1.05

0.000

1.14

0.000

Weeks 37-40
(10 Sep  7 Oct)

0.98

0.074

1.06

0.000

1.08

0.000

Weeks 41-44
(8 Oct  4 Nov)

1.00

0.802

1.08

0.000

1.01

0.258

Weeks 45-48
(5 Nov- 2 Dec)

0.98

0.095

1.08

0.000

1.02

0.137

Weeks 49-52
(3 Dec  31 Dec)

0.98

0.015

1.10

0.000

0.98

0.116

Sex

males (RG)

1(RG)

Females

0.64

0.000

Period

1968-1974

1(RG)

1975-1979

0.95

0.000

1980-1984

0.94

0.000

1985-1989

0.91

0.000

1990-1994

0.92

0.000

1995+

0.91

0.000

Age

50-54

1(RG)

55-59

1.54

0.000

60-64

2.48

0.000

65-69

3.91

0.000

70-74

6.26

0.000

75-79

9.92

0.000

80-84

15.79

0.000

85-89

25.77

0.000

90+

45.76

0.000

RG.......reference group, RMR... Relative Mortality Risk

Table 3b: Model 2b: Relative mortality risk estimated by a multivariate
survival model which includes simultaneously the second-order interactions between
"time lived since last birthday" and "month of birth", and the
covariates "sex" and "cohort".